diff --git a/src/Monolog/Handler/SocketHandler.php b/src/Monolog/Handler/SocketHandler.php
index c458b1ca..7a61bf4e 100644
--- a/src/Monolog/Handler/SocketHandler.php
+++ b/src/Monolog/Handler/SocketHandler.php
@@ -30,6 +30,7 @@ class SocketHandler extends AbstractProcessingHandler
     private $persistent = false;
     private $errno;
     private $errstr;
+    private $lastWritingAt;
 
     /**
      * @param string  $connectionString Socket connection string